A concrete TupleTupleBinding that delegates to the
MarshalledTupleEntry and
MarshalledTupleKeyEntity interfaces of the entity class.

This class calls the methods of the MarshalledTupleEntry
interface to convert between the data entry and entity object. It calls the
methods of the MarshalledTupleKeyEntity interface to convert between
the key entry and the entity object. These two interfaces must both be
implemented by the entity class.